<div class="col-sm-3 col-md-2 sidebar">
    <div class="my-menu-item" href="#menu-son1" data-toggle="collapse"><a>图书管理</a></div>
    <ul class="nav nav-sidebar collapse" id="menu-son1">
        <li><a href="{% url 'book:publisher_list' %}">出版社列表</a></li>
        <li><a href="{% url 'book:book_list' %}">图书列表</a></li>
        <li><a href="{% url 'book:author_list' %}">作者列表</a></li>
    </ul>
    <div class="my-menu-item" href="#menu-son2" data-toggle="collapse"><a>菜单二</a></div>
    <ul class="nav nav-sidebar collapse" id="menu-son2">
        <li><a href="http://v3.bootcss.com/examples/dashboard/">Nav item</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">Nav item again</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">One more nav</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">Another nav item</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">More navigation</a></li>
    </ul>
    <div class="my-menu-item" href="#menu-son3" data-toggle="collapse"><a>菜单三</a></div>
    <ul class="nav nav-sidebar collapse" id="menu-son3">
        <li><a href="http://v3.bootcss.com/examples/dashboard/">Nav item again</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">One more nav</a></li>
        <li><a href="http://v3.bootcss.com/examples/dashboard/">Another nav item</a></li>
    </ul>
</div>